/Engine/Plugins/Developer/Concert/ConcertMain/Source/ConcertTransport/Public/IConcertEndpoint.h
Set the message channel ID, for friend class
static void SetMessageChannelId ( const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [IConcertMessage](API\Plugins\ConcertTransport\IConcertMessage) > & Message, uint16 ChannelId )